/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
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 */

package com.sun.mail.pop3;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * POP3 Server.
 * 
 * @author sbo
 */
public final class POP3Server extends Thread {
    
    /** Server socket. */
    private ServerSocket serverSocket;
    
    /** Keep on? */
    private volatile boolean keepOn;
    
    /** Port to listen. */
    private final int port;
    
    /** POP3 handler. */
    private final POP3Handler handler;
    
    /**
     * POP3 server.
     * 
     * @param handler
     *            handler
     * @param port
     *            port to listen
     */
    public POP3Server(final POP3Handler handler, final int port) {
        this.handler = handler;
        this.port = port;
    }
    
    /**
     * Exit POP3 server.
     */
    public void quit() {
        try {
            this.keepOn = false;
            if (this.serverSocket != null && !this.serverSocket.isClosed()) {
                this.serverSocket.close();
                this.serverSocket = null;
            }
        } catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }
    
    /**
     * Open a server socket.
     * 
     * @return server socket
     * @throws IOException
     *             unable to open socket
     */
    private ServerSocket openServerSocket() throws IOException {
        return new ServerSocket(this.port, 0, null);
    }
    
    /**
     * {@inheritDoc}
     */
    public void run() {
        try {
            this.keepOn = true;
            
            try {
                this.serverSocket = this.openServerSocket();
            } catch (final IOException e) {
                throw new RuntimeException(e);
            }
            
            while (this.keepOn) {
                try {
                    final Socket clientSocket = this.serverSocket.accept();
                    final POP3Handler pop3Handler =
			(POP3Handler)this.handler.clone();
                    pop3Handler.setClientSocket(clientSocket);
                    pop3Handler.start();
                } catch (final IOException e) {
                    //e.printStackTrace();
                }
            }
        } finally {
            this.quit();
        }
    }
}
